[sdiy] CMOS for linear circuits.

[ryan williams]

hi paul,

thanks for the comments.

Paul Perry wrote:
> I notice on the glasgow theremin circuit, there is a note saying to do the
> layout the way they say. That (in my experience) is code for "we spent
> weeks hacking around until we gave up & used separate chips & fluked a
> layout that kind of works".

The antenna section they have seems to work pretty well (as far as the 
layout). I built just the pitch section so far. and I forgot bypass 
caps, wasn't even a problem. I just don't seem to trust the designs of 
students. This is due to all the crappy designs  I've seen (mine included).

> So I would definitely just copy theirs as close as you can. The chips are
> like 20 cents each, after all.
> I never got the glasgow theremin to work very well myself.
> I went optical instead.

I have it copied for now. I suppose I am just goint to try and merge the 
gates that are not using any feedback. I have no problem keeping the 
ones used as HF oscillators seperate. The circuit, when I built it, did 
not work very well. I changed some RC values so that it would give a 
0-8V CV over a 2foot to about 1inch hand distance.

-ryan